Search found 26 matches

by Chr$
Fri Aug 16, 2019 10:38 pm
Forum: Compatibles Corner
Topic: ICL OPD (Merlin Tonto)
Replies: 10
Views: 1089

Re: ICL OPD (Merlin Tonto)

I'm going to see if my monitor may be salvageable first. I changed the main RIFA cap that goes over the mains input (it was blown, very obviously blown). The monitor powers up, brightness control works, leds are on, but all it shows is a long horizontal bright line. Reading up, it looks like it may ...
by Chr$
Thu Aug 15, 2019 7:54 pm
Forum: Hardware
Topic: MAB 8049H P A038 comapible?
Replies: 10
Views: 770

Re: MAB 8049H P A038 comapible?

None of them are Sinclair branded, but it looks like you were right tofro! I put the A028 chip in and it made an angry beep and hung at the multicoloured reset screen. A known working A038 fitted and all is well again. I don't know 100% if the A028 was fully ok, but it's not worth trying it again, I...
by Chr$
Tue Aug 13, 2019 3:30 pm
Forum: Hardware
Topic: MAB 8049H P A038 comapible?
Replies: 10
Views: 770

Re: MAB 8049H P A038 comapible?

That's enough reassurance for me! I'll get one and try it out. Thanks.
by Chr$
Tue Aug 13, 2019 1:18 pm
Forum: Hardware
Topic: MAB 8049H P A038 comapible?
Replies: 10
Views: 770

MAB 8049H P A038 comapible?

The Philips branded '8049' controller chip in my QL is a MAB 8049H P A038.

Does anyone know if a MAB 8049H P A028 would also work? I'm not sure if the A038 is any different or if that slight difference is irrelevant.

Thanks.
by Chr$
Mon Aug 12, 2019 8:07 pm
Forum: Compatibles Corner
Topic: ICL OPD (Merlin Tonto)
Replies: 10
Views: 1089

Re: ICL OPD (Merlin Tonto)

Oh. I don't really understand video signals!

So it is possible. Will you be making composite for yours, or using the RGB?
by Chr$
Sun Aug 11, 2019 10:42 pm
Forum: Compatibles Corner
Topic: ICL OPD (Merlin Tonto)
Replies: 10
Views: 1089

Re: ICL OPD (Merlin Tonto)

Oh yes, fairly obvious then. Thanks very much for that. What I don't yet get, is after that is done, where is the signal connection for the composite vid?
by Chr$
Sun Aug 11, 2019 10:24 am
Forum: Compatibles Corner
Topic: ICL OPD (Merlin Tonto)
Replies: 10
Views: 1089

Re: ICL OPD (Merlin Tonto)

Thanks. Yes I saw that the OPD requires +5 volts 3 to 3.5 Amps +12 volts 1.5 Amps -5 volts 0.1 Amps And have found this old PC PSU on eBay looks to have the right voltages. So am I right in thinking that if I change that chip to invert the video, then connect TP3 (what exactly is TP3?) to pin 15 of ...
by Chr$
Sat Aug 10, 2019 9:19 pm
Forum: Compatibles Corner
Topic: ICL OPD (Merlin Tonto)
Replies: 10
Views: 1089

ICL OPD (Merlin Tonto)

I too have acquired a Merlin Tonto, but as usual the monitor doesn't work after the previous owner dropped it, rendering the whole thing even more useless that a Telephony Computer from 1984 would normally be in 2019! I do have some ICL cartridges in a 4 pack and the Xchange ROM pack etc, so it all ...
by Chr$
Mon Jun 17, 2019 8:00 pm
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 67
Views: 7541

Re: Today I Received...

The other day I received this very lovable contemporary case-modded ZX81! It's looks very important, like it wouldn't have been out of place in a serious industrial setting, with a proper keyboard (by Klaus Jeschke in Germany according to its PCB) and as a bonus, it must have been used for some prop...
by Chr$
Wed Jun 12, 2019 9:37 am
Forum: Software & Programming
Topic: Controlling DIR scrolling
Replies: 9
Views: 840

Re: Controlling DIR scrolling

It would appear that the use of KEYROW doesn't actually work. I tried the following ... 100 DIR win1_ 110 dummy = KEYROW(0) 120 PRINT #0,"All clear" The typed in characters are appearing after the All clear message. It's beginning to look like the only way would be to avoid using TK2 and ...